I've just seen Episode 16, and boy did Mitsuru get his butt kicked by Basara and his new Drazeros, big time!
Oh, and I'm watching the sub of Episode 06. Not only that, but it seemed that Garuburn knew of Mitsuru's intention of stealing him. Not only that, but Ryouma is actually Kamon's older brother like SouPudelik said. Kamon was apparently the Southern B-Master before losing his memories, most likely in a losing battle against Ryouma.
Now I get it, Kamon lost against Ryouma and was exiled from his B-Master position and losing his memories of B-Daman and most of his family members except Aona. From what I could make out, Kamon didn't like the way the Road Fight rules encouraged B-Ders to bully each other, so he confronted Ryouma over the issue and lost.
Geez, Kamon's got family issues! His older brother is the most powerful B-Der in Crest Land and encourage B-Ders to make their losing opponents do things for them, Aona wasn't initially keen on having her younger brother play B-Daman but warmed up to it (one issue down), and Gogyo is keeping it a secret from him that he's his dad.
"It is written among the limitless constellations of the celestial heavens, and in the depths of the emerald seas, and upon every grain of sand in the vast deserts, that the world which we see is an outed and visible dream of an inward and invisible reality." - Opening narration, The Thief and the Cobbler (original workprint)